In a capacitive touchpad, a plurality of sensing zones are defined, and a
controller is connected with a plurality of scan lines for sensing a
movement of an object slipping on the plurality of sensing zones, wherein
at least one of the plurality of scan lines is connected to at least two
of the plurality of sensing zones. The distance, speed and direction of
the movement are determined by detecting the object on the touchpad at
two positions upon two scans, and thereby the control of a scroll bar is
accomplished. The capacitive touchpad is applied for a Z-axis arrangement
on a mouse and a scroll arrangement on a keyboard.